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As I understand it, you can add new creature banks to the map generator template. But you can’t add anything to existing maps.
There isn’t any object in the game like a “random creature bank.” That’s how new neutral creatures were added. They were added to the list in the “random creature of level x” object. You can’t do that with banks.
But if you replace a building, this would work on all maps.
I’m leaning towards replacing the Leprechaun, the Temple, or the Fairy Circle, depending on which one appears more often on maps. Plus, I just don’t like the Leprechaun and the Fairy Circle. If you replace the Temple with a new bank, you can replace the Fairy Circle with the Temple, so it will still be in the game, just in different places.
By the way, I have a problem: the game freezes when I try to generate a random map using the NCF executable. Is that supposed to happen, or am I doing something wrong?